How to clean? Put some lotion or hand sanitizer. And then put into the warm water, knead, swiping the inside and outside in pour water, after repeated several times. Use dry towels to dry the hole. Finally dry it naturally. 1.Don’t use alcohol, soap for cleaning, bath dew is advisable.! 2.Water temperature must be not too high.Do not use hot water! 3.Avoiding scratch! 4.Pls put some baby powder in the surface to prevent dust and keep dry when stored